Gregory P. Smith <g...@krypto.org> added the comment:

Indeed, the `host` on that line there should just be ignored with the IP 
address of the original data connection used in its place.

Your https://hackerone.com/reports/1040166 link provides plenty of information 
and likes to prior art mitigations other ftp clients including Firefox and 
Chrome well over a decade ago.

----------
assignee:  -> gregory.p.smith
nosy: +gregory.p.smith
stage:  -> needs patch
versions: +Python 3.10, Python 3.6, Python 3.7, Python 3.8

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue43285>
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